A chicken egg is a single cell protected by a shell on the outside. A student 6 points puts three eggs into dilute acid and leaves them for three days. The acid
dissolves the egg shells, leaving the contents of the egg surrounded by
the cell membrane. The student then removes the eggs from the dilute
acid and uses water to wash the
acid away. The student then uses the
eggs for this osmosis experiment. 1. He measures the mass of each egg. 2.
He then puts one egg into a beaker containing distilled/pure water. 3. He
then puts another egg into a beaker containing 5% salt solution. 4. He puts
a third egg into a beaker containing 15% salt solution. 5. After 15 minutes
he removes each egg from its beaker and measure the mass again. The
bar graph below shows the results obtained by the student from the
osmosis experiment.
A. Name the independent variable in this experiment.
(1 mark)
B. Name the dependent variable in this experiment. (1 mark)
C. Explain the results for the egg placed in distilled/pure water. (2 marks)
D. Which of the three solutions was the most hypertonic? (1 mark)
E. List one controlled variable in this experiment. (1 mark)

Can someone please help